Forum OpenACS Q&A: Re: Will Dr. OpenACS survive? Or why I stopped worrying and learned to love the .LRN consortium?
How about three documents (User, Administrator, and Developer) starting from one url? https://openacs.org/xowiki/openacs-handbook Ignore the categories on the left side-bar if you want to get more of a document tree perspective.
Let me rephrase that a bit:
Three links with three documents (html and/or pdf), not three links pointing to many other links.
It is pretty obvious that the developers and some users grew up with or grew into OpenACS over many years, probably from it's beginning and all that information seems natural to them. Not so for a person who has never used it before.
It's true that those pages try to keep 1 topic per page, and are organized somewhat organically to fit various reader's needs.
It seems like you are wanting documentation in a traditional format. What about this? https://openacs.org/test-doc/